Clarification on Selected PATS DTCs

Clarification on Selected PATS DTCs Stored in PATS Control

Utilize the pinpoint testing found in the appropriate Workshop Manual for proper troubleshooting. Refer to the following for supplemental pinpoint details.

B1213: Less than two (2) keys programmed to the PATS control. If DTCs B1232, B1600, B1601, B1602, or B1681 are present, they must be serviced first. If B1213 is the only self test DTC, then cycle second PATS key in ignition to program.

B1232/B2103: Transceiver module antenna failure. Replace transceiver module.

B1600: No PATS key read by the PATS control. This can be caused by the PATS key, PATS transceiver, circuits between the PATS transceiver / PATS control, and/or the PATS control.

B1601: Unprogrammed PATS key. There is no issue with the PATS key itself, but must be programmed into the PATS memory (unless maximum number of keys are already programmed). Follow Spare Key Programming Procedure from this bulletin. There should be no need for parts replacement for this code.

B1602: Partial PATS key was read. Verify that approved key is being used. Large metal objects, additional PATS keys, or devices to purchase gasoline located on the customer's key chain can cause interference. Instruct the customer to keep such items from touching the ignition key during engine start. It is not necessary to remove the objects from the customer's key chain. Remote starter equipment can also cause this fault code. Remove any remote starter equipment close to the transceiver before conducting further diagnosis. This DTC can be caused by the PATS key or PATS transceiver.

B1681: PATS transceiver module signal is not received by the PATS control. This code can be caused by circuits between PATS transceiver and PATS control, PATS transceiver, or possibly the PATS control. Follow pinpoint test for troubleshooting. This can also be caused by using the wrong transceiver part number. Verify the correct transceiver part number is being used.

B2139: The PCM_ID does not match between the PCM and PATS.

B2141: NVM configuration failure. This means PATS does not have a stored PCM_ID in memory (PATS PID PCM_ID = not STORED). If DTC U1147 is also present, it must be fixed first. Attempt to fix a U1262 first as well, but it may not be required to fix this fault prior to the B2141.

U1262: This code indicates a communication issue (Bus+, Bus-) between the PATS and some other module. Do not perform PATS diagnostics if a no start is not reported or if theft indicator is not flashing rapidly at ignition ON position. If the indicator is flashing. check to make sure the PCM is powered up and operating. If not, continue with PCM diagnostics.

Clarification on Selected PATS DTCs Stored in PCM - PATS Type B

P1260: This code will be stored any time the PCM disables the vehicle because of the PATS system. Whenever the PCM has a stored P1260, there should be stored DTCs in PATS that require troubleshooting.

U1147: This code indicates a communication issue (Bus+, Bus-) between the PCM and PATS. This code CANNOT be caused by the PATS key, PATS transceiver, or the circuits between PATS transceiver and PATS control. Whenever PATS has U1147 as a stored DTC, there should be a "P1260 Theft Detected - Engine Disabled" in the PCM stored codes. Verify that P1260 is stored in PCM. If not, there is a possible power-up issue of the PCM (i.e. PATS is powering up at key to ON/START but the PCM is not, therefore when PATS tries to communicate over PIN 15 and 16 to the PCM, there is no response). Verify power and ground circuits to the PCM and verify the tester can communicate with the PCM.

Clarification on Selected PATS DTCs Stored in PCM - PATS Type E

B1213: Less than two (2) keys programmed to the PATS control. Erase continuous codes, cycle ignition, then retrieve continuous fault codes again. If DTCs B1232, B1600, B1601, B1602, or B1681 are present, they must be serviced first. If B1213 is the only PATS related code stored, then cycle second PATS key in ignition to program.

B1342: Electronic Control Unit (ECU) defective. Memory failure in PCM. Replace PCM.

B1600: No PATS key read by the PCM. This can be caused by the PATS key, PATS transceiver, circuits between the PATS transceiver / PCM, and/or the PCM.

B1601: Unprogrammed PATS key. There is no issue with the PATS key itself but must be programmed into the PATS memory (unless maximum number of keys are already programmed). Follow Spare Key Programming Procedure from this bulletin. There should be no need for parts replacement for this code.

B1602: Partial PATS key was read. Verify that approved key is being used. Large metal objects, additional PATS keys, or devices to purchase gasoline located on the customer's key chain can cause interference. Instruct the customer to keep such items from touching the ignition key during engine start. It is not necessary to remove the objects from the customer's key chain. Remote starter equipment can also cause this fault code. Remove any remote starter equipment close to the transceiver before conducting further diagnosis. This DTC can be caused by the PATS key or PATS transceiver.

B1681: PATS transceiver module signal is not received by the PCM. This code can be caused by circuits between PATS transceiver and PCM, PATS transceiver, or possibly the PCM. Follow pinpoint test for troubleshooting. This can also be caused by using the wrong transceiver part number. Verify the correct transceiver part number is being used.

B2103: Transceiver module antenna failure. Replace transceiver module.

B2431: The ignition key was not programmed. Reference the Key Selection Chart at the beginning of this bulletin to verify that you are using the correct key.